Based on available information, the Boltz Lake Road 399 boat ramp in Grant County, Kentucky is a concrete boat ramp that provides access to Boltz Lake. The ramp is reportedly 16 feet wide, which should be sufficient for most vehicles and trailers. The lake itself is a 96-acre reservoir that was created in the 1960s for flood control and recreational purposes.

According to Kentucky Fish and Wildlife, Boltz Lake permits fishing for a variety of species including largemouth bass, bluegill, crappie, and channel catfish. As for boating, the lake allows for boats with electric motors and allows canoes, kayaks, and other non-motorized watercraft.

It's always recommended to verify this information with local authorities, as rules and regulations can change over time.